61780725 has 30 divisors (see below), whose sum is σ = 114443010. Its totient is φ = 32948640.

The previous prime is 61780711. The next prime is 61780753. The reversal of 61780725 is 52708716.

It can be written as a sum of positive squares in 3 ways, for example, as 1034289 + 60746436 = 1017^2 + 7794^2 .

It is not a de Polignac number, because 61780725 - 2¹⁰ = 61779701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61780725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 13230 + ... + 17279.

It is an arithmetic number, because the mean of its divisors is an integer number (3814767).

Almost surely, 2^61780725 is an apocalyptic number.

It is an amenable number.

61780725 is a deficient number, since it is larger than the sum of its proper divisors (52662285).

61780725 is a wasteful number, since it uses less digits than its factorization.

61780725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30531 (or 30517 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 61780725 is about 7860.0715645597. The cubic root of 61780725 is about 395.3220148262.

The spelling of 61780725 in words is "sixty-one million, seven hundred eighty thousand, seven hundred twenty-five".